Debian Security Advisory

DSA-2233-1 postfix -- several vulnerabilities

Date Reported:
10 May 2011
Affected Packages:
Security database references:
In Mitre's CVE dictionary: CVE-2009-2939, CVE-2011-0411, CVE-2011-1720.
More information:

Several vulnerabilities were discovered in Postfix, a mail transfer agent. The Common Vulnerabilities and Exposures project identifies the following problems:

  • CVE-2009-2939

    The postinst script grants the postfix user write access to /var/spool/postfix/pid, which might allow local users to conduct symlink attacks that overwrite arbitrary files.

  • CVE-2011-0411

    The STARTTLS implementation does not properly restrict I/O buffering, which allows man-in-the-middle attackers to insert commands into encrypted SMTP sessions by sending a cleartext command that is processed after TLS is in place.

  • CVE-2011-1720

    A heap-based read-only buffer overflow allows malicious clients to crash the smtpd server process using a crafted SASL authentication request.

For the oldstable distribution (lenny), this problem has been fixed in version 2.5.5-1.1+lenny1.

For the stable distribution (squeeze), this problem has been fixed in version 2.7.1-1+squeeze1.

For the unstable distribution (sid), this problem has been fixed in version 2.8.0-1.

We recommend that you upgrade your postfix packages.